The Tor Browser: content/canvas/test/webgl-conformance/conformance/misc/uninitialized-test.html@6474c204b198 (annotated)

content/canvas/test/webgl-conformance/conformance/misc/uninitialized-test.html@6474c204b198 (annotated)

content/canvas/test/webgl-conformance/conformance/misc/uninitialized-test.html

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>WebGL Uninitialized GL Resources Tests</title>
 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
 <script src="../../resources/js-test-pre.js"></script>
 <script src="../resources/webgl-test.js"></script>
 <script src="../resources/webgl-test-utils.js"></script>
 </head>
 <body>
 <div id="description"></div>
 <div id="console"></div>
 <canvas id="canvas" width="2" height="2"> </canvas>
 <script>
 description("Tests to check user code cannot access uninitialized data from GL resources.");
 var wtu = WebGLTestUtils;
 var gl = wtu.create3DContext("canvas");
 if (!gl)
   testFailed("Context created.");
 else
   testPassed("Context created.");
 function setupTexture(texWidth, texHeight) {
     var texture = gl.createTexture();
     gl.bindTexture(gl.TEXTURE_2D, texture);
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, texWidth, texHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
     // this can be quite undeterministic so to improve odds of seeing uninitialized data write bits
     // into tex then delete texture then re-create one with same characteristics (driver will likely reuse mem)
     // with this trick on r59046 WebKit/OSX I get FAIL 100% of the time instead of ~15% of the time.
     var badData = new Uint8Array(texWidth * texHeight * 4);
     for (var i = 0; i < badData.length; ++i)
         badData[i] = i % 255;
     gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, texWidth, texHeight, gl.RGBA, gl.UNSIGNED_BYTE, badData);
     gl.finish(); // make sure it has been uploaded
     gl.deleteTexture(texture);
     gl.finish(); // make sure it has been deleted
     var texture = gl.createTexture();
     gl.bindTexture(gl.TEXTURE_2D, texture);
     return texture;
 }
 function checkNonZeroPixels(texture, texWidth, texHeight, skipX, skipY, skipWidth, skipHeight, skipR, skipG, skipB, skipA) {
     gl.bindTexture(gl.TEXTURE_2D, null);
     var fb = gl.createFramebuffer();
     gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
     gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
     shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
     var data = new Uint8Array(texWidth * texHeight * 4);
     gl.readPixels(0, 0, texWidth, texHeight, gl.RGBA, gl.UNSIGNED_BYTE, data);
     var k = 0;
     for (var y = 0; y < texHeight; ++y) {
         for (var x = 0; x < texWidth; ++x) {
             var index = (y * texWidth + x) * 4;
             if (x >= skipX && x < skipX + skipWidth && y >= skipY && y < skipY + skipHeight) {
                 if (data[index] != skipR || data[index + 1] != skipG || data[index + 2] != skipB || data[index + 3] != skipA) {
                     testFailed("non-zero pixel values are wrong at (" + x + ", " + y + "), data was (" +
                                data[index] + "," + data[index + 1] + "," + data[index + 2] + "," + data[index + 3] +
                                ") should have been (" + skipR + "," + skipG + "," + skipB + "," + skipA + ")");
                     return;
                 }
             } else {
                 for (var i = 0; i < 4; ++i) {
                     if (data[index + i] != 0)
                         k++;
                 }
             }
         }
     }
     if (k) {
         testFailed("Found " + k + " non-zero bytes");
     } else {
         testPassed("All data initialized");
     }
 }
 var width = 512;
 var height = 512;
 debug("");
 debug("Reading an uninitialized texture (texImage2D) should succeed with all bytes set to 0.");
 var tex = setupTexture(width, height);
 gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
 checkNonZeroPixels(tex, width, height, 0, 0, 0, 0, 0, 0, 0, 0);
 gl.deleteTexture(tex);
 gl.finish();
 glErrorShouldBe(gl, gl.NO_ERROR);
 debug("");
 debug("Reading an uninitialized portion of a texture (copyTexImage2D) should succeed with all bytes set to 0.");
 var tex = setupTexture(width, height);
 var fbo = gl.createFramebuffer();
 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
 var rbo = gl.createRenderbuffer();
 gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
 var fboWidth = 16;
 var fboHeight = 16;
 gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, fboWidth, fboHeight);
 gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
 gl.clearColor(1.0, 0.0, 0.0, 1.0);
 gl.clear(gl.COLOR_BUFFER_BIT);
 glErrorShouldBe(gl, gl.NO_ERROR);
 gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, width, height, 0);
 checkNonZeroPixels(tex, width, height, 0, 0, fboWidth, fboHeight, 255, 0, 0, 255);
 gl.deleteTexture(tex);
 gl.finish();
 glErrorShouldBe(gl, gl.NO_ERROR);
 debug("");
 debug("Reading an uninitialized portion of a texture (copyTexImage2D with negative x and y) should succeed with all bytes set to 0.");
 var tex = setupTexture(width, height);
 var fbo = gl.createFramebuffer();
 gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
 var rbo = gl.createRenderbuffer();
 gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
 var fboWidth = 16;
 var fboHeight = 16;
 gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, fboWidth, fboHeight);
 gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);
 shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
 gl.clearColor(1.0, 0.0, 0.0, 1.0);
 gl.clear(gl.COLOR_BUFFER_BIT);
 glErrorShouldBe(gl, gl.NO_ERROR);
 var x = -8;
 var y = -8;
 gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, x, y, width, height, 0);
 checkNonZeroPixels(tex, width, height, -x, -y, fboWidth, fboHeight, 255, 0, 0, 255);
 gl.deleteTexture(tex);
 gl.finish();
 glErrorShouldBe(gl, gl.NO_ERROR);
 debug("");
 debug("Reading an uninitialized portion of a texture (copyTexImage2D from WebGL internal fbo) should succeed with all bytes set to 0.");
 var tex = setupTexture(width, height);
 gl.bindFramebuffer(gl.FRAMEBUFFER, null);
 gl.clearColor(0.0, 1.0, 0.0, 0.0);
 gl.clear(gl.COLOR_BUFFER_BIT);
 glErrorShouldBe(gl, gl.NO_ERROR);
 gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, width, height, 0);
 checkNonZeroPixels(tex, width, height, 0, 0, gl.canvas.width, gl.canvas.height, 0, 255, 0, 0);
 gl.deleteTexture(tex);
 gl.finish();
 glErrorShouldBe(gl, gl.NO_ERROR);
 //TODO: uninitialized vertex array buffer
 //TODO: uninitialized vertex elements buffer
 //TODO: uninitialized framebuffer? (implementations would need to do a GL clear at first binding?)
 //TODO: uninitialized renderbuffer? (implementations would need to do a GL clear at first binding?)
 //TODO: uninitialized uniform arrays?
 debug("");
 successfullyParsed = true;
 </script>
 <script>finishTest();</script>
 </body>
 </html>

The Tor Browser / annotate

content/canvas/test/webgl-conformance/conformance/misc/uninitialized-test.html@6474c204b198 (annotated)

content/canvas/test/webgl-conformance/conformance/misc/uninitialized-test.html